Bettencourt, B.Ann, and Nancy Dorr. 1998. “Cooperative Interaction and Intergroup Bias: Effects of Numerical Representation and Cross-Cut Role Assignment”. Personality & Social Psychology Bulletin 24: 1276-93. doi:10.1177/01461672982412003. Reference Link
Bettencourt, B.Ann, Kelly Charlton, and Cyndi Kernahan. 1997. “Numerical Representation of Groups in Cooperative Settings: Social Orientation Effects on Ingroup Bias”. Journal of Experimental Social Psychology 33: 630-59. doi:10.1006/jesp.1997.1334. Reference Link
Bettencourt, B.Ann, Marilynn B Brewer, Marian Rogers Croak, and Norman Miller. 1992. “Cooperation and the Reduction of Intergroup Bias: The Role of Reward Structure and Social Orientation”. Journal of Experimental Social Psychology 28: 301-19. doi:10.1016/0022-1031(92)90048-O. Reference Link